diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..128850f --- /dev/null +++ b/.gitignore @@ -0,0 +1,20 @@ +# IDE +.vscode + +# application specific +wdek*.json +coverage.out +cleartext* +demo.* +samples/*.enc +plaintext.pdf +logs.out + +# avoid certificates +*.pem +tools/*.pem +tools/generate_cert + + +# binaries +tinkproxy \ No newline at end of file diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md new file mode 100644 index 0000000..654a071 --- /dev/null +++ b/CONTRIBUTING.md @@ -0,0 +1,28 @@ +# How to Contribute + +We'd love to accept your patches and contributions to this project. There are +just a few small guidelines you need to follow. + +## Contributor License Agreement + +Contributions to this project must be accompanied by a Contributor License +Agreement. You (or your employer) retain the copyright to your contribution; +this simply gives us permission to use and redistribute your contributions as +part of the project. Head over to to see +your current agreements on file or to sign a new one. + +You generally only need to submit a CLA once, so if you've already submitted one +(even if it was for a different project), you probably don't need to do it +again. + +## Code reviews + +All submissions, including submissions by project members, require review. We +use GitHub pull requests for this purpose. Consult +[GitHub Help](https://help.github.com/articles/about-pull-requests/) for more +information on using pull requests. + +## Community Guidelines + +This project follows [Google's Open Source Community +Guidelines](https://opensource.google/conduct/). diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..d645695 --- /dev/null +++ b/LICENSE @@ -0,0 +1,202 @@ + + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright [yyyy] [name of copyright owner] + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. diff --git a/README.md b/README.md new file mode 100644 index 0000000..2e89ef7 --- /dev/null +++ b/README.md @@ -0,0 +1,41 @@ +# storage-client-side-encryption-proxy +This tool uses Tink to perform client side encryption operations backed against Google Cloud KMS. It is both a client side encryption/decryption tool as well as a decrypting proxy for Google Cloud Storage. + +**This is not an officially supported Google product** + +## Pre-Setup +1. You have golang 1.14 or newer installed + +## Setup +1. Create a service account that can encrypt and decrypt +2. Use application credential: https://cloud.google.com/docs/authentication/production +3. Setup a bucket to store your encrypted files. +4. Setup KMS and create a key in the same region as your bucket +5. acquire certificate and corresponding key for TLS. Place in the `tools` directory, and name them as follows. Note: you can change the names and location by altering the `scriptes/variables.sh` file + 1. `tools/cert.pem` + 2. `tools/key.pem` + 3. Note: for testing, consider creating a self signed cert: https://golang.org/src/crypto/tls/generate_cert.go +6. edit `scripts/variables.sh` with your GCP information (i.e bucket name and key name) + +## Building +1. `go build -o tinkproxy` + +## Running +This example uses the binary built named `tinkproxy` as described in the previous step. The tool uses Tink backed by Google Cloud KMS to encrypt a data encryption key (DEK) per directory, which is then +uploaded to your GCS bucket. After the encrypted files are uploaded, a single file is then downlaod through the decrypting proxy, which decrypts using the appropriate KMS key. +1. `./tinkproxy --help` +2. `source scripts/variables.sh` # be sure to edit the configuration to match your environment +3. `./scripts/uploadDirectory.sh samples` +4. `./scripts/getObject.sh` +5. `./scripts/cleanup.sh` + +Also, you can encrypt and decrypt individual files +1. `./tinkproxy vanish samples/gettysburg.pdf -o demo.cipher` +2. `./tinkproxy reveal demo.cipher -o cleartext.pdf` + +## Production Considerations +Consider the following items when using for production. +1. build and version the binary +2. deploy the proxy on trusted compute such as shielded VMs, use tmpfs, and private network access along with other controls to mitigate data exfiltration (e.g VPC-SC) +3. use certificates and AAD that meet your security governance requirements +4. use appropriate logging levels and client timeouts diff --git a/cmd/proxy.go b/cmd/proxy.go new file mode 100644 index 0000000..36f0dd5 --- /dev/null +++ b/cmd/proxy.go @@ -0,0 +1,82 @@ +/** + * Copyright 2020 Google LLC + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * https://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package cmd + +import ( + "fmt" + "log" + "net/http" + "time" + + "github.com/GoogleCloudPlatform/storage-client-side-encryption-proxy/decryptionproxy" + "github.com/GoogleCloudPlatform/storage-client-side-encryption-proxy/env" + + "github.com/pkg/errors" + "github.com/spf13/cobra" +) + +// proxyCmd represents the proxy command +var proxyCmd = &cobra.Command{ + Use: "proxy", + Short: "Starts a decrypting proxy server to GCS", + Long: `Supports a GET request to retrieve encrypted files using Tink to decrypt it. + Defaults to localhost:8080 unless otherwise specified by environment variables`, + Run: func(cmd *cobra.Command, args []string) { + fmt.Println("proxy called") + config, err := env.Get() + if err != nil { + log.Fatal(err) + } + logger := config.Logger() + + hc, errClient := config.Client.BasicTLSClient() + if err != nil { + errClient := errors.Wrap(errClient, "cannot init https client") + logger.Fatalf("%+v", errClient) + } + + tinkProxyHandler := getHandler(config, hc) + + middlewareHandlers := decryptionproxy.Decorate(tinkProxyHandler, decryptionproxy.LoggerHandler(logger), + decryptionproxy.RouteHandler(), + decryptionproxy.ConstraintHandler(logger), + ) + + s := &http.Server{ + Addr: config.Proxy.Listen, + Handler: middlewareHandlers, + ReadTimeout: 2 * time.Second, // handle slow clients + WriteTimeout: 2 * config.Client.Timeout, // give room for GCS request to complete + MaxHeaderBytes: 1 << 20, + } + + logger.Infof("Starting proxy %s", config.Proxy.Listen) + logger.Fatal(s.ListenAndServeTLS(config.Proxy.CertFilePath, config.Proxy.CertKeyFilePath)) + }, +} + +func getHandler(c env.Config, hc *http.Client) http.HandlerFunc { + proxyHandler := decryptionproxy.New(c, hc) + + return func(w http.ResponseWriter, r *http.Request) { + proxyHandler.ServeHTTP(w, r) + } +} + +func init() { + rootCmd.AddCommand(proxyCmd) +} diff --git a/cmd/reveal.go b/cmd/reveal.go new file mode 100644 index 0000000..def6477 --- /dev/null +++ b/cmd/reveal.go @@ -0,0 +1,91 @@ +/** + * Copyright 2020 Google LLC + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * https://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package cmd + +import ( + "encoding/base64" + "encoding/json" + "fmt" + "io/ioutil" + "log" + + "github.com/GoogleCloudPlatform/storage-client-side-encryption-proxy/data" + "github.com/GoogleCloudPlatform/storage-client-side-encryption-proxy/env" + + "github.com/google/tink/go/core/registry" + "github.com/google/tink/go/integration/gcpkms" + "github.com/pkg/errors" + "github.com/spf13/cobra" +) + +// revealCmd represents the reveal command +var revealCmd = &cobra.Command{ + Use: "reveal", + Short: "Make encrypted data appear", + Long: `Using a Tink enabled KMS backend, decrypt the data. If the outputFile is provided, + the plaintext is saved there.`, + Run: func(cmd *cobra.Command, args []string) { + fmt.Println("reveal called") + + config, err := env.Get() + if err != nil { + log.Fatal(err) + } + logger := config.Logger() + + keyURI := config.KmsMkekURI + gcpclient, err := gcpkms.NewClient(keyURI) + if err != nil { + err := errors.Wrap(err, "gcp client creation failed") + logger.Fatalf("%+v", err) + } + + registry.RegisterKMSClient(gcpclient) + + f, errRead := ioutil.ReadFile(args[0]) + if errRead != nil { + errRead := errors.Wrap(errRead, "check file") + logger.Fatalf("%+v", errRead) + } + var b data.EncryptedData + if errUnmarshal := json.Unmarshal(f, &b); errUnmarshal != nil { + errUnmarshal := errors.Wrap(errUnmarshal, "cannot unmarshal") + logger.Fatalf("%+v", errUnmarshal) + } + + ee := data.NewEncryptionEngine(b.KekName, b.WdekName, gcpclient, logger) + ee.Load(b) + + cipher, errDecode := base64.StdEncoding.DecodeString(b.EncryptedData) + if errDecode != nil { + errDecode := errors.Wrap(errDecode, "unexpected wdek format. Use Tink") + logger.Fatalf("%+v", errDecode) + } + ciphertext := ee.Reveal(cipher) + + if outputFile != "" { + if err := ioutil.WriteFile(outputFile, ciphertext, 0644); err != nil { + err := errors.Wrap(err, "check file or disk space") + logger.Fatalf("%+v", err) + } + } + }, +} + +func init() { + rootCmd.AddCommand(revealCmd) +} diff --git a/cmd/root.go b/cmd/root.go new file mode 100644 index 0000000..0b44832 --- /dev/null +++ b/cmd/root.go @@ -0,0 +1,83 @@ +/** + * Copyright 2020 Google LLC + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * https://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package cmd + +import ( + "fmt" + "os" + + "github.com/spf13/cobra" + + homedir "github.com/mitchellh/go-homedir" + "github.com/spf13/viper" +) + +var ( + cfgFile string + outputFile string +) + +// rootCmd represents the base command when called without any subcommands +var rootCmd = &cobra.Command{ + Use: "tinkproxy", + Short: "Uses Tink for end to end encryption", + Long: `Performs crypto operations using Tink to provide end to end encryption`, +} + +// Execute adds all child commands to the root command and sets flags appropriately. +// This is called by main.main(). It only needs to happen once to the rootCmd. +func Execute() { + if err := rootCmd.Execute(); err != nil { + fmt.Println(err) + os.Exit(1) + } +} + +func init() { + cobra.OnInitialize(initConfig) + + rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.mage.yaml)") + rootCmd.PersistentFlags().StringVarP(&outputFile, "outputFile", "o", "", "specify where to store the ciphertext") + + rootCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle") +} + +// initConfig reads in config file and ENV variables if set. +func initConfig() { + if cfgFile != "" { + // Use config file from the flag. + viper.SetConfigFile(cfgFile) + } else { + // Find home directory. + home, err := homedir.Dir() + if err != nil { + fmt.Println(err) + os.Exit(1) + } + + // Search config in home directory with name ".tinkproxy" (without extension). + viper.AddConfigPath(home) + viper.SetConfigName(".tinkproxy") + } + + viper.AutomaticEnv() // read in environment variables that match + + // If a config file is found, read it in. + if err := viper.ReadInConfig(); err == nil { + fmt.Println("Using config file:", viper.ConfigFileUsed()) + } +} diff --git a/cmd/vanish.go b/cmd/vanish.go new file mode 100644 index 0000000..b61110a --- /dev/null +++ b/cmd/vanish.go @@ -0,0 +1,151 @@ +/** + * Copyright 2020 Google LLC + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * https://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package cmd + +import ( + "encoding/json" + "fmt" + "io/ioutil" + "log" + "os" + "strings" + + "github.com/GoogleCloudPlatform/storage-client-side-encryption-proxy/data" + "github.com/GoogleCloudPlatform/storage-client-side-encryption-proxy/env" + + "github.com/google/tink/go/core/registry" + "github.com/google/tink/go/integration/gcpkms" + "github.com/pkg/errors" + "github.com/sirupsen/logrus" + "github.com/spf13/cobra" +) + +// vanishCmd represents the vanish command +var vanishCmd = &cobra.Command{ + Use: "vanish", + Short: "make data vanish by encrypting the entire file or directory", + Long: `Using a Tink enabled KMS backend, encrypt the data. If the outputFile is provided, +the ciphertext saved there. outputFile is ignored, if a directory is being encrypted.`, + Args: cobra.MinimumNArgs(1), + Run: func(cmd *cobra.Command, args []string) { + fmt.Println("vanish called") + + config, err := env.Get() + if err != nil { + log.Fatal(err) + } + logger := config.Logger() + + keyURI := config.KmsMkekURI + gcpclient, err := gcpkms.NewClient(keyURI) + if err != nil { + err := errors.Wrap(err, "gcp client creation failed") + logger.Fatalf("%+v", err) + } + + wDekPathName := config.DekPathName + registry.RegisterKMSClient(gcpclient) + + ee := data.NewEncryptionEngine(keyURI, wDekPathName, gcpclient, logger) + + // support both a file or directory + sourceItem := args[0] + fi, err := os.Stat(sourceItem) + if err != nil { + err := errors.Wrap(err, "check the specified file/directory.") + logger.Fatalf("%+v", err) + } + switch mode := fi.Mode(); { + case mode.IsRegular(): + handleFile(sourceItem, ee, logger) + case mode.IsDir(): + handleDir(sourceItem, ee, logger) + case mode&os.ModeSymlink != 0: + logger.Fatalf("%+v", errors.New("cannot handle symLink")) + case mode&os.ModeNamedPipe != 0: + logger.Fatalf("%+v", errors.New("cannot handle pipes")) + } + }, +} + +func handleDir(dir string, ee *data.EncryptionEngine, logger *logrus.Logger) { + files, err := ioutil.ReadDir(dir) + if err != nil { + err := errors.Wrap(err, "cannot read directory") + logger.Fatalf("%+v", err) + } + + if outputFile != "" { + logger.Info("Ignoring output file name. Processing a directory.") + } + + // Create a wDEK + ee.WriteWdek() + + for _, file := range files { + // Skip encrypted files + if strings.Contains(file.Name(), "enc") { + continue + } + + fmt.Println(file.Name()) + f, err := ioutil.ReadFile(dir + "/" + file.Name()) + if err != nil { + err := errors.Wrap(err, "cannot read file") + logger.Fatalf("%+v", err) + } + + ciphertext := ee.Obfuscate(f) + encryptedBlob := ee.Package(ciphertext) + b, errMarshal := json.Marshal(encryptedBlob) + if errMarshal != nil { + errMarshal := errors.Wrap(errMarshal, "marshal encrypted data to package for writing") + logger.Fatalf("%+v", errMarshal) + } + + if errWrite := ioutil.WriteFile(dir+"/"+file.Name()+".enc", b, 0644); err != nil { + errWrite := errors.Wrap(errWrite, "cannot write wdek") + logger.Fatalf("%+v", errWrite) + } + } +} + +func handleFile(file string, ee *data.EncryptionEngine, logger *logrus.Logger) { + f, err := ioutil.ReadFile(file) + if err != nil { + log.Fatal(err) + } + ee.WriteWdek() + ciphertext := ee.Obfuscate(f) + + encryptedBlob := ee.Package(ciphertext) + b, errMarshal := json.Marshal(encryptedBlob) + if errMarshal != nil { + errMarshal := errors.Wrap(errMarshal, "marshal encrypted data to package for writing") + logger.Fatalf("%+v", errMarshal) + } + if outputFile != "" { + if err := ioutil.WriteFile(outputFile, b, 0644); err != nil { + err := errors.Wrap(err, "check specified output") + logger.Fatalf("%+v", err) + } + } +} + +func init() { + rootCmd.AddCommand(vanishCmd) +} diff --git a/data/data.go b/data/data.go new file mode 100644 index 0000000..b5338a4 --- /dev/null +++ b/data/data.go @@ -0,0 +1,195 @@ +/** + * Copyright 2020 Google LLC + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * https://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package data + +import ( + "io" + "io/ioutil" + "os" + + "github.com/pkg/errors" + + "github.com/google/tink/go/aead" + "github.com/google/tink/go/core/registry" + "github.com/google/tink/go/keyset" + "github.com/sirupsen/logrus" +) + +// EncryptionEngine specifies necessary details to use Tink. +type EncryptionEngine struct { + kekName string + wDekPathName string // path name to file containing wdek + aad string + dekHandle *keyset.Handle // dek in memory (in clear) + gcpClient registry.KMSClient + logger *logrus.Logger +} + +// Encryptor defines methods to support data encryption +type Encryptor interface { + Obfuscate(data io.Reader) + Reveal() io.Writer + + ReadWdek() + WriteWdek() + + Package(data []byte) EncryptedData + Load(data EncryptedData) +} + +//NewEncryptionEngine creates engines with required parameters +func NewEncryptionEngine(kekName string, wDekPathName string, gcpClient registry.KMSClient, logger *logrus.Logger) *EncryptionEngine { + return &EncryptionEngine{ + kekName: kekName, + wDekPathName: wDekPathName, + gcpClient: gcpClient, + logger: logger, + } +} + +// ReadWdek loads the wdek using KMS +func (ee *EncryptionEngine) ReadWdek() { + fo, err := os.Open(ee.wDekPathName) + if err != nil { + err := errors.Wrapf(err, "cannot read wdek to unmarshal it %s", ee.wDekPathName) + ee.logger.Fatalf("%+v", err) + } + defer fo.Close() + + backend, errClient := ee.gcpClient.GetAEAD(ee.kekName) + if errClient != nil { + errClient := errors.Wrap(errClient, "cannot retrieve dek from KMS") + ee.logger.Fatalf("%+v", errClient) + } + + jreader := keyset.NewJSONReader(fo) + masterKey := aead.NewKMSEnvelopeAEAD(*aead.AES256GCMKeyTemplate(), backend) + + // Read the encrypted keyset handle back from the io.Reader implementation + // and decrypt it using the master key. + ee.dekHandle, err = keyset.Read(jreader, masterKey) + if err != nil { + err := errors.Wrap(err, "cannot created wdek handle") + ee.logger.Fatalf("%+v", err) + } +} + +// WriteWdek outputs JSON file with wDEK (encrypted) +func (ee *EncryptionEngine) WriteWdek() { + if ee.dekHandle == nil { + ee.logger.Info("creating a new DEK, since none found") + dek := aead.AES256GCMKeyTemplate() + kh, err := keyset.NewHandle(dek) + if err != nil { + err := errors.Wrap(err, "creating dek key handle failed") + ee.logger.Fatalf("%+v", err) + } + ee.dekHandle = kh + } + + f, errCreate := os.Create(ee.wDekPathName) + if errCreate != nil { + errCreate := errors.Wrapf(errCreate, "writing wdek failed %s", ee.wDekPathName) + ee.logger.Fatalf("%+v", errCreate) + } + defer f.Close() + + jwriter := keyset.NewJSONWriter(f) + + backend, errClient := ee.gcpClient.GetAEAD(ee.kekName) + if errClient != nil { + errClient := errors.Wrap(errClient, "cannot retrieve dek") + ee.logger.Fatalf("%+v", errClient) + } + + wdek := aead.NewKMSEnvelopeAEAD(*aead.AES256GCMKeyTemplate(), backend) + + // Write encrypts the keyset handle with the master key and writes to the + // io.Writer implementation (memKeyset). + if err := ee.dekHandle.Write(jwriter, wdek); err != nil { + err := errors.Wrap(err, "cannot write JSON marshalled wdek") + ee.logger.Fatalf("%+v", err) + } +} + +// Obfuscate encrypts data using the underlying encryption engine +func (ee *EncryptionEngine) Obfuscate(dataPlain []byte) []byte { + ee.logger.Infof("...encrypting using this master KEK %s\n", ee.kekName) + + if ee.dekHandle == nil { + ee.ReadWdek() + } + + a, err := aead.New(ee.dekHandle) + if err != nil { + err := errors.Wrap(err, "AEAD encryption object creation failed") + ee.logger.Fatalf("%+v", err) + } + + ct, err := a.Encrypt(dataPlain, []byte(ee.aad)) + if err != nil { + err := errors.Wrap(err, "cannot encrypt") + ee.logger.Fatalf("%+v", err) + } + + return ct +} + +// Reveal decrypts data using the underlying encryption engine +func (ee *EncryptionEngine) Reveal(cipherData []byte) []byte { + ee.logger.Infof("...decrypting with this master KEK %s\n", ee.kekName) + + if ee.dekHandle == nil { + ee.ReadWdek() + } + + a, err := aead.New(ee.dekHandle) + if err != nil { + err := errors.Wrap(err, "cannot create AEAD object from wdek") + ee.logger.Fatalf("%+v", err) + } + + pt, err := a.Decrypt(cipherData, []byte(ee.aad)) + if err != nil { + err := errors.Wrap(err, "cannot decrypt data") + ee.logger.Fatalf("%+v", err) + } + + return pt +} + +// Load grabs the wDek and reads it in. +func (ee *EncryptionEngine) Load(data EncryptedData) { + if err := ioutil.WriteFile(ee.wDekPathName, []byte(data.Wdek), 0644); err != nil { + err := errors.Wrapf(err, "cannot create file for loading: %s", ee.wDekPathName) + ee.logger.Fatalf("%+v", err) + } + + ee.ReadWdek() +} + +// Package marshalls the encrypted data with key hierarchy information to be stored as a blob of structured data +func (ee *EncryptionEngine) Package(data []byte) EncryptedData { + ee.WriteWdek() + wdek, err := ioutil.ReadFile(ee.wDekPathName) + if err != nil { + err := errors.Wrap(err, "cannot open wdek") + ee.logger.Fatalf("%+v", err) + } + + return NewEncryptedData(ee.kekName, ee.wDekPathName, string(wdek), data) +} diff --git a/data/data_test.go b/data/data_test.go new file mode 100644 index 0000000..2e79730 --- /dev/null +++ b/data/data_test.go @@ -0,0 +1,149 @@ +/** + * Copyright 2020 Google LLC + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * https://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package data + +import ( + "io/ioutil" + "log" + "reflect" + "testing" + + "github.com/GoogleCloudPlatform/storage-client-side-encryption-proxy/env" + + "github.com/google/tink/go/core/registry" + "github.com/google/tink/go/integration/gcpkms" + "github.com/google/tink/go/keyset" + "github.com/pkg/errors" +) + +func TestEncryptionEngine_WdekOps(t *testing.T) { + config, err := env.Get() + if err != nil { + log.Fatal(err) + } + + keyURI := config.KmsMkekURI + gcpclient, err := gcpkms.NewClient(keyURI) + if err != nil { + err := errors.Wrap(err, "gcp client creation failed") + log.Fatal(err) + } + + registry.RegisterKMSClient(gcpclient) + + type fields struct { + wDekPathName string + dekHandle *keyset.Handle + } + tests := []struct { + name string + fields fields + }{ + { + "simpleTest", + fields{ + "wdek2.json", + nil, + }, + }, + } + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + ee := &EncryptionEngine{ + kekName: keyURI, + wDekPathName: tt.fields.wDekPathName, + dekHandle: tt.fields.dekHandle, + gcpClient: gcpclient, + logger: config.Logger(), + } + ee.WriteWdek() + ee.ReadWdek() + }) + } +} + +func TestEncryptionEngine_EncryptDecrypt(t *testing.T) { + config, err := env.Get() + if err != nil { + log.Fatal(err) + } + + keyURI := config.KmsMkekURI + + gcpclient, err := gcpkms.NewClient(keyURI) + if err != nil { + err := errors.Wrap(err, "gcp client creation failed") + log.Fatal(err) + } + + registry.RegisterKMSClient(gcpclient) + + gettysburgFile, err := ioutil.ReadFile("../samples/gettysburg.pdf") + if err != nil { + log.Fatal(err) + } + + type fields struct { + wDekPathName string + dekHandle *keyset.Handle + } + type args struct { + dataPlain []byte + } + tests := []struct { + name string + fields fields + args args + }{ + { + "simpleTest", + fields{ + "wdek2.json", + nil, + }, + args{ + []byte("encrypt this"), + }, + }, + { + "FileTest", + fields{ + "wdek2.json", + nil, + }, + args{ + gettysburgFile, + }, + }, + } + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + ee := &EncryptionEngine{ + kekName: keyURI, + wDekPathName: tt.fields.wDekPathName, + dekHandle: tt.fields.dekHandle, + gcpClient: gcpclient, + logger: config.Logger(), + } + got := ee.Obfuscate(tt.args.dataPlain) + plaintext := ee.Reveal(got) + if !reflect.DeepEqual(plaintext, tt.args.dataPlain) { + t.Errorf("EncryptionEngine.Reveal() = %v, want %v", plaintext, tt.args.dataPlain) + } + }) + } +} diff --git a/data/storage.go b/data/storage.go new file mode 100644 index 0000000..9397613 --- /dev/null +++ b/data/storage.go @@ -0,0 +1,43 @@ +/** + * Copyright 2020 Google LLC + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * https://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package data + +import ( + "encoding/base64" +) + +// EncryptedData is the object stored in the bucket. +// EncryptedData is base64 encoded for transfer. +// Wdek from Tink is json and encrypted. +// WdekName is the primaryKeyID for the dek +// KekName is the key stored in GCP KMS +type EncryptedData struct { + KekName string `json:"kek"` + WdekName string `json:"wdekName"` + Wdek string `json:"wdek"` + EncryptedData string `json:"data"` +} + +// NewEncryptedData constructs an object to send to GCS +func NewEncryptedData(kekName string, wdekName string, wdek string, data []byte) EncryptedData { + return EncryptedData{ + KekName: kekName, + WdekName: wdekName, + Wdek: wdek, + EncryptedData: base64.StdEncoding.EncodeToString(data), + } +} diff --git a/data/storage_test.go b/data/storage_test.go new file mode 100644 index 0000000..5896d9c --- /dev/null +++ b/data/storage_test.go @@ -0,0 +1,64 @@ +/** + * Copyright 2020 Google LLC + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * https://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package data + +import ( + "encoding/base64" + "reflect" + "testing" +) + +func TestNewEncryptedData(t *testing.T) { + kekName := "fake/resource/keyring/key" + wdekName := "wdek.json" + wdek := "12345678" + data := []byte{1, 2, 3, 4} + type args struct { + kekName string + wdekName string + wdek string + data []byte + } + tests := []struct { + name string + args args + want EncryptedData + }{ + { + name: "basic test", + args: args{ + kekName: kekName, + wdekName: wdekName, + wdek: wdek, + data: data, + }, + want: EncryptedData{ + KekName: kekName, + WdekName: wdekName, + Wdek: wdek, + EncryptedData: base64.StdEncoding.EncodeToString(data), + }, + }, + } + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + if got := NewEncryptedData(tt.args.kekName, tt.args.wdekName, tt.args.wdek, tt.args.data); !reflect.DeepEqual(got, tt.want) { + t.Errorf("NewEncryptedData() = %v, want %v", got, tt.want) + } + }) + } +} diff --git a/decryptionproxy/constrainthandler.go b/decryptionproxy/constrainthandler.go new file mode 100644 index 0000000..041184d --- /dev/null +++ b/decryptionproxy/constrainthandler.go @@ -0,0 +1,52 @@ +/** + * Copyright 2020 Google LLC + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * https://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package decryptionproxy + +import ( + "net/http" + + "github.com/pkg/errors" + + "github.com/sirupsen/logrus" +) + +// ConstraintHandler middleware enforces limitations that the proxy currently has +// 1. proxy only supports GET +// 2. must have at least a bucket name +func ConstraintHandler(logger *logrus.Logger) Decorator { + return func(handler http.Handler) http.Handler { + return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + ///<1> supported methods + if r.Method != http.MethodGet && + r.Method != http.MethodHead { + err := errors.New("method not yet supported") + logger.Errorf("%s: %+v", r.Method, err) + http.Error(w, err.Error(), http.StatusMethodNotAllowed) + return + } + + ///<2> valid objects + if r.URL.Path == "/" { + err := errors.New("must specify a valid object, not root directory") + logger.Errorf("%+v", err) + http.Error(w, err.Error(), http.StatusBadRequest) + return + } + handler.ServeHTTP(w, r) + }) + } +} diff --git a/decryptionproxy/decorator.go b/decryptionproxy/decorator.go new file mode 100644 index 0000000..e2ee642 --- /dev/null +++ b/decryptionproxy/decorator.go @@ -0,0 +1,32 @@ +/** + * Copyright 2020 Google LLC + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * https://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package decryptionproxy + +import ( + "net/http" +) + +// Decorator allows creation of uniform middleware for the proxy +type Decorator func(http.Handler) http.Handler + +// Decorate executes each middleware in the order it's specified +func Decorate(handler http.Handler, decorators ...Decorator) http.Handler { + for i := len(decorators) - 1; i >= 0; i-- { + handler = decorators[i](handler) + } + return handler +} diff --git a/decryptionproxy/decryptionproxy.go b/decryptionproxy/decryptionproxy.go new file mode 100644 index 0000000..620f891 --- /dev/null +++ b/decryptionproxy/decryptionproxy.go @@ -0,0 +1,177 @@ +/** + * Copyright 2020 Google LLC + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * https://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package decryptionproxy + +import ( + "context" + "encoding/base64" + "encoding/json" + "io/ioutil" + "net/http" + "net/url" + "strings" + + "github.com/pkg/errors" + + "github.com/GoogleCloudPlatform/storage-client-side-encryption-proxy/data" + "github.com/GoogleCloudPlatform/storage-client-side-encryption-proxy/env" + + "github.com/google/tink/go/core/registry" + "github.com/google/tink/go/integration/gcpkms" + + "github.com/sirupsen/logrus" +) + +// GcsEndpoint specifies REST base endpoint for GCS +const GcsEndpoint = "storage.googleapis.com" + +type handler struct { + logger *logrus.Logger + config env.Config + restClient *http.Client +} + +//ServeHTTP overwrites behavior to handle GET and performs decryption through Tink +func (h *handler) ServeHTTP(w http.ResponseWriter, r *http.Request) { + defer r.Body.Close() + + // err and wrapper variables are used to communicate errors from calling GCP APIs + var err error + resp := RespWrapper{ + Status: http.StatusOK, + ResponseWriter: w, + } + + // At completion, provide details on bad response from REST calls to GCP + defer func() { + if err != nil { + h.logger.WithFields(logrus.Fields{ + "response": resp.Status, + }).WithError(err).Errorf("failed while decrypting %+v", err) + } + }() + + ctx, cancel := context.WithTimeout(r.Context(), h.config.Proxy.Timeout) + defer cancel() + + bucketEndpoint := h.config.BucketName + "." + GcsEndpoint + url := url.URL{ + Scheme: "https", + Host: bucketEndpoint, + Path: r.URL.RequestURI(), + } + + proxyToGCSReq, err := http.NewRequest(r.Method, url.String(), nil) + if err != nil { + http.Error(resp, err.Error(), http.StatusInternalServerError) + resp.SaveStatus(http.StatusInternalServerError) + return + } + + proxyToGCSReq = proxyToGCSReq.WithContext(ctx) + + copyReqHeader(proxyToGCSReq.Header, r.Header) + + gcsResp, err := h.restClient.Do(proxyToGCSReq) + if err != nil { + http.Error(w, err.Error(), http.StatusInternalServerError) + resp.SaveStatus(http.StatusInternalServerError) + return + } + defer gcsResp.Body.Close() + + copyRespHeader(resp, gcsResp) + + /// Decrypt response using Tink + // from this point forward, unless otherwise specified, kill the proxy for any decryption erreor, since something + // seriously wrong. + // client will timeout for long operations based on environment variables + keyURI := h.config.KmsMkekURI + kmsClient, err := gcpkms.NewClient(keyURI) + if err != nil { + err := errors.Wrap(err, "gcp client creation failed") + h.logger.Fatalf("%+v", err) + } + + registry.RegisterKMSClient(kmsClient) + + bodyBytes, err := ioutil.ReadAll(gcsResp.Body) + if err != nil { + err := errors.Wrap(err, "cannot read ciphertext from GCS") + h.logger.Fatalf("%+v", err) + } + + var b data.EncryptedData + if errUnmarshal := json.Unmarshal(bodyBytes, &b); errUnmarshal != nil { + err = errors.Wrap(errUnmarshal, "either bad object name or unexpected structure from GCS") + http.Error(resp, err.Error(), http.StatusBadRequest) + resp.SaveStatus(http.StatusBadRequest) + return + } + + ee := data.NewEncryptionEngine(b.KekName, b.WdekName, kmsClient, h.logger) + ee.Load(b) + + cipher, errDecode := base64.StdEncoding.DecodeString(b.EncryptedData) + if errDecode != nil { + err := errors.Wrap(errDecode, "possible incomplete GCS transfer.") + h.logger.Fatalf("%+v", err) + } + + plaintext := ee.Reveal(cipher) + + length, errRespWrite := resp.Write(plaintext) + if errRespWrite != nil { + err := errors.Wrap(errRespWrite, "could not write plaintext into client response") + h.logger.Fatalf("%+v", err) + } + h.logger.Debugf("writer length: %v", length) + + // the size of the file in the bucket is different due to encryption, so when decrypted, its size doesn't match what + // a client (i.e curl) might expect. Avoids getting an error such as "(18) transfer closed with NN bytes remaining to read" where NN is the difference. + resp.Header().Add("Content-Length", string(length)) +} + +// New returns a tink proxy handler +func New(c env.Config, client *http.Client) http.Handler { + logger := c.Logger() + return &handler{logger: logger, restClient: client, config: c} +} + +// from httputil +func copyReqHeader(dst, src http.Header) { + for k, vv := range src { + for _, v := range vv { + dst.Add(k, v) + } + } +} + +// copies GCS response headers to proxy to client +func copyRespHeader(dst RespWrapper, src *http.Response) { + for k, vv := range src.Header { + for _, v := range vv { + // skip content length since encrypted and decrypted lengths will be different. + // set it later after decryption + if strings.Contains(k, "Content-Length") { + continue + } + dst.Header().Add(k, v) + } + } + dst.WriteHeader(src.StatusCode) +} diff --git a/decryptionproxy/loggerhandler.go b/decryptionproxy/loggerhandler.go new file mode 100644 index 0000000..6bb5d29 --- /dev/null +++ b/decryptionproxy/loggerhandler.go @@ -0,0 +1,45 @@ +/** + * Copyright 2020 Google LLC + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * https://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package decryptionproxy + +import ( + "net/http" + "time" + + "github.com/sirupsen/logrus" +) + +// LoggerHandler middleware adds logging before and after the main handler is invoked +func LoggerHandler(logger *logrus.Logger) Decorator { + return func(handler http.Handler) http.Handler { + return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + start := time.Now() + defer func() { + if logger.Level >= logrus.DebugLevel { + fields := logrus.Fields{ + "method": r.Method, + "rtt": time.Since(start).String(), + "path": r.URL.RequestURI(), + } + entry := logger.WithFields(fields) + entry.Debug("finished logging middleware") + } + }() + handler.ServeHTTP(w, r) + }) + } +} diff --git a/decryptionproxy/routehandler.go b/decryptionproxy/routehandler.go new file mode 100644 index 0000000..e16fe89 --- /dev/null +++ b/decryptionproxy/routehandler.go @@ -0,0 +1,40 @@ +/** + * Copyright 2020 Google LLC + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * https://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package decryptionproxy + +import ( + "net/http" + "strings" +) + +// RouteHandler middleware does basic path checks. Enforces a root path +func RouteHandler() Decorator { + return func(handler http.Handler) http.Handler { + return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + + // handle route construction. + if r.URL.Path != "" { + if !strings.HasPrefix(r.URL.Path, "/") { + r.URL.Path = "/" + r.URL.Path + } + handler.ServeHTTP(w, r) + } else { + http.Error(w, "not found", http.StatusNotFound) + } + }) + } +} diff --git a/decryptionproxy/wrapper.go b/decryptionproxy/wrapper.go new file mode 100644 index 0000000..bd8b7a4 --- /dev/null +++ b/decryptionproxy/wrapper.go @@ -0,0 +1,31 @@ +/** + * Copyright 2020 Google LLC + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * https://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package decryptionproxy + +import "net/http" + +// RespWrapper contains response status +type RespWrapper struct { + Status int + http.ResponseWriter +} + +// SaveStatus eases logging http status and updates status in the response header +func (w *RespWrapper) SaveStatus(status int) { + w.Status = status + w.ResponseWriter.WriteHeader(status) +} diff --git a/decryptionproxy/wrapper_test.go b/decryptionproxy/wrapper_test.go new file mode 100644 index 0000000..7360dc1 --- /dev/null +++ b/decryptionproxy/wrapper_test.go @@ -0,0 +1,58 @@ +/** + * Copyright 2020 Google LLC + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * https://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package decryptionproxy + +import ( + "net/http" + "net/http/httptest" + "testing" +) + +func Test_respWrapper_WriteHeader(t *testing.T) { + type fields struct { + status int + ResponseWriter http.ResponseWriter + } + type args struct { + status int + } + tests := []struct { + name string + fields fields + args args + }{ + { + name: "simple wrapper test", + fields: fields{ + status: http.StatusOK, + ResponseWriter: httptest.NewRecorder(), + }, + args: args{ + status: http.StatusOK, + }, + }, + } + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + w := &RespWrapper{ + Status: tt.fields.status, + ResponseWriter: tt.fields.ResponseWriter, + } + w.WriteHeader(tt.args.status) + }) + } +} diff --git a/env/client.go b/env/client.go new file mode 100644 index 0000000..3b7810a --- /dev/null +++ b/env/client.go @@ -0,0 +1,62 @@ +/** + * Copyright 2020 Google LLC + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * https://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package env + +import ( + "context" + "crypto/tls" + "net/http" + "time" + + "cloud.google.com/go/storage" + "google.golang.org/api/option" + ghttp "google.golang.org/api/transport/http" +) + +// ClientConfig for Google Cloud Storage +type ClientConfig struct { + Timeout time.Duration `split_words:"true" default:"3s"` + IdleConnTimeout time.Duration `split_words:"true" default:"60s"` + MaxIdleConns int `split_words:"true" default:"30"` +} + +// BasicTLSClient sets up TLS, default application credentials, and timeouts. +func (c ClientConfig) BasicTLSClient() (*http.Client, error) { + cfg := &tls.Config{ + MinVersion: tls.VersionTLS12, + CurvePreferences: []tls.CurveID{tls.CurveP521, tls.CurveP384, tls.CurveP256}, + PreferServerCipherSuites: true, + CipherSuites: []uint16{ + tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, + tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, + tls.TLS_RSA_WITH_AES_256_GCM_SHA384, + tls.TLS_RSA_WITH_AES_256_CBC_SHA, + }, + } + + t := http.Transport{ + IdleConnTimeout: c.IdleConnTimeout, + MaxIdleConns: c.MaxIdleConns, + TLSClientConfig: cfg, + } + gTransport, err := ghttp.NewTransport(context.Background(), &t, option.WithScopes(storage.ScopeReadOnly)) + + return &http.Client{ + Timeout: c.Timeout, + Transport: gTransport, + }, err +} diff --git a/env/env.go b/env/env.go new file mode 100644 index 0000000..dd85851 --- /dev/null +++ b/env/env.go @@ -0,0 +1,78 @@ +/** + * Copyright 2020 Google LLC + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * https://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package env + +import ( + "io" + "log" + "os" + + "github.com/kelseyhightower/envconfig" + "github.com/sirupsen/logrus" +) + +// Config environment variables used by envconfig +type Config struct { + LogLevel string `split_words:"true" default:"debug"` + LogFile string `split_words:"true"` + BucketName string `split_words:"true" required:"true"` + KmsMkekURI string `split_words:"true" required:"true"` + DekPathName string `split_words:"true" required:"true"` + AAD string `split_words:"true" required:"true"` + Client ClientConfig + Proxy ProxyConfig +} + +// Logger configures logging based on env variables +func (c Config) Logger() *logrus.Logger { + badLevelName := false + + level, err := logrus.ParseLevel(c.LogLevel) + if err != nil { + badLevelName = true + level = logrus.DebugLevel + } + + logger := logrus.New() + + // determine if logs need to be sent to a file in addition to Stdout, which is the default + if c.LogFile != "" { + // always overwrite logfile + logFile, err := os.Create(c.LogFile) + if err != nil { + log.Fatal(err) + } + mw := io.MultiWriter(os.Stdout, logFile) + logger.Out = mw + } else { + logger.Out = os.Stdout + } + + logger.Level = level + if badLevelName { + logger.WithField("LogLevel", c.LogLevel).WithError(err).Warn("unknown logging level. check your environment variable") + } + + return logger +} + +// Get loads the configuration from environment variables. +func Get() (Config, error) { + var c Config + err := envconfig.Process("tinkproxy", &c) + return c, err +} diff --git a/env/proxy.go b/env/proxy.go new file mode 100644 index 0000000..e5d8340 --- /dev/null +++ b/env/proxy.go @@ -0,0 +1,27 @@ +/** + * Copyright 2020 Google LLC + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * https://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package env + +import "time" + +// ProxyConfig contains configuration for the proxy mode. +type ProxyConfig struct { + Listen string `default:":8080"` + Timeout time.Duration `split_words:"true" default:"10s"` + CertFilePath string `split_words:"true" required:"true"` + CertKeyFilePath string `split_words:"true" required:"true"` +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..a7fdd38 --- /dev/null +++ b/go.mod @@ -0,0 +1,15 @@ +module github.com/GoogleCloudPlatform/storage-client-side-encryption-proxy + +go 1.14 + +require ( + cloud.google.com/go/storage v1.6.0 + github.com/google/tink/go v0.0.0-20200415212014-15bc9c0a2c8f + github.com/kelseyhightower/envconfig v1.4.0 + github.com/mitchellh/go-homedir v1.1.0 + github.com/pkg/errors v0.9.1 + github.com/sirupsen/logrus v1.4.2 + github.com/spf13/cobra v1.0.0 + github.com/spf13/viper v1.6.3 + google.golang.org/api v0.21.0 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..d6afb87 --- /dev/null +++ b/go.sum @@ -0,0 +1,419 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= +cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU= +cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY= +cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc= +cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0= +cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To= +cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4= +cloud.google.com/go v0.53.0 h1:MZQCQQaRwOrAcuKjiHWHrgKykt4fZyuwF2dtiG3fGW8= 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+ * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * https://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package main + +import ( + "github.com/GoogleCloudPlatform/storage-client-side-encryption-proxy/cmd" +) + +func main() { + cmd.Execute() +} diff --git a/samples/gettysburg.pdf b/samples/gettysburg.pdf new file mode 100644 index 0000000..24c4cdd Binary files /dev/null and b/samples/gettysburg.pdf differ diff --git a/samples/gettysburg2.pdf b/samples/gettysburg2.pdf new file mode 100644 index 0000000..24c4cdd Binary files /dev/null and b/samples/gettysburg2.pdf differ diff --git a/scripts/cleanup.sh b/scripts/cleanup.sh new file mode 100755 index 0000000..573731c --- /dev/null +++ b/scripts/cleanup.sh @@ -0,0 +1,20 @@ +#!/usr/bin/env bash +# +# Copyright 2020 Google LLC +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# https://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +rm plaintext.pdf +rm samples/*.enc +rm wdek.json +rm logs.out diff --git a/scripts/getObject.sh b/scripts/getObject.sh new file mode 100755 index 0000000..2541b3c --- /dev/null +++ b/scripts/getObject.sh @@ -0,0 +1,54 @@ +#/usr/bin/env bash +# +# Copyright 2020 Google LLC +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# https://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +ENCRYPED_OBJ="gettysburg.pdf.enc" +OUTPUT_FILENAME="plaintext.pdf" + +echo "" +echo "===================================================" +echo "starting proxy to GCS: ${TINKPROXY_BUCKET_NAME:?}" +./tinkproxy proxy & +echo "===================================================" +read -p "press enter to continue" + +echo "" +echo "===================================================" +echo "downloading file: ${ENCRYPED_OBJ} through proxy from ${TINKPROXY_BUCKET_NAME}" +read -p "press enter to continue" +echo "" +curl -k https://localhost:8080/${ENCRYPED_OBJ} -o ${OUTPUT_FILENAME} +echo "" +echo "" +echo "retrieved ${ENCRYPED_OBJ} as ${OUTPUT_FILENAME} and decrypted it" +echo "===================================================" +read -p "press enter to continue" + +echo "" +echo "===================================================" +echo "comparing the decrypted file with original file" +diff -s ${OUTPUT_FILENAME} samples/gettysburg.pdf +echo "===================================================" +read -p "press enter to continue" + +echo "" +echo "===================================================" +echo "stopping proxy" +kill %1 +echo "===================================================" + +echo "" +echo "Success" +echo "" diff --git a/scripts/uploadDirectory.sh b/scripts/uploadDirectory.sh new file mode 100755 index 0000000..a622be9 --- /dev/null +++ b/scripts/uploadDirectory.sh @@ -0,0 +1,39 @@ +#!/usr/bin/env bash +# +# Copyright 2020 Google LLC +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# https://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +DIR=$1 + +echo "" +echo "===================================================" +echo "Encrypting client side - all files in directory: ${DIR:?}" +read -p "press enter to continue" + +./tinkproxy vanish ${DIR} +echo "===================================================" +echo "" +read -p "press enter to continue" + +echo "===================================================" +echo "Uploading all files into bucket: ${TINKPROXY_BUCKET_NAME:?}" +read -p "press enter to continue" +# TINKPROXY encrypts files and encode it changing suffix to .enc +gsutil -m cp ${DIR}/*.enc gs://${TINKPROXY_BUCKET_NAME} +echo "===================================================" +read -p "press enter to continue" + +echo "" +echo "Success" +echo "" diff --git a/scripts/variables.sh b/scripts/variables.sh new file mode 100755 index 0000000..8ddb017 --- /dev/null +++ b/scripts/variables.sh @@ -0,0 +1,67 @@ +#!/usr/bin/env bash +# +# Copyright 2020 Google LLC +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# https://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +#=============================================================== +# The following MUST be set to your project specific +# resource names and environment (i.e TLS certificates) +#=============================================================== + +# Provide project name +export GOOGLE_CLOUD_PROJECT="" + +# name of GCS bucket where encrypted files are stored +# do not include gs:// as part of the name +export TINKPROXY_BUCKET_NAME="" + +# include full resource name to GCP KMS +# example "gcp-kms://projects//locations/us/keyRings//cryptoKeys/" +export TINKPROXY_KMS_MKEK_URI="" + +# proxy only runs in TLS +export TINKPROXY_PROXY_CERT_FILE_PATH="tools/cert.pem" +export TINKPROXY_PROXY_CERT_KEY_FILE_PATH="tools/key.pem" + +# AAD for AES encryption. Pick a value that is meaningful and do not lose it. +# data cannot be decrypted unless the same AAD value is supplied at encryption time. +export TINKPROXY_AAD="this aad" + +#=============================================================== +# The following are configurable, but do not need to be changed. +#=============================================================== + +# path and file name of where to find DEK +export TINKPROXY_DEK_PATH_NAME="wdek.json" + +# store log files +export TINKPROXY_LOG_FILE="logs.out" + +#=============================================================== +# Output for visual inspection +#=============================================================== +echo "" +echo "Environment setup with values:" +echo "===================================================" +echo "Credentials Path: ${GOOGLE_APPLICATION_CREDENTIALS:?}" +echo "Project: ${GOOGLE_CLOUD_PROJECT:?}" +echo "Bucket Name: ${TINKPROXY_BUCKET_NAME:?}" +echo "KMS Master KEK URI: ${TINKPROXY_KMS_MKEK_URI:?}" +echo "DEK Pathname: ${TINKPROXY_DEK_PATH_NAME:?}" +echo "Log Level: ${TINKPROXY_LOG_LEVEL:DEBUG}" +echo "Log File: ${TINKPROXY_LOG_FILE:?}" +echo "Certificate File Path: ${TINKPROXY_PROXY_CERT_FILE_PATH:?}" +echo "Certificate Key File Path: ${TINKPROXY_PROXY_CERT_KEY_FILE_PATH:?}" +echo "===================================================" +echo "" diff --git a/tools/README.md b/tools/README.md new file mode 100644 index 0000000..f814119 --- /dev/null +++ b/tools/README.md @@ -0,0 +1,7 @@ +# Tools Directory +The tools directory is used to store the certificate and key used for TLS. + +## Files +Defaults expect your certificate and key to be names as follows: +`cert.pem` +`key.pem`